WO2015113227A1 - Procédés de fonctionnement d'activation/désactivation de microcellules reposant sur une signalisation par radio de microcellules - Google Patents

Procédés de fonctionnement d'activation/désactivation de microcellules reposant sur une signalisation par radio de microcellules Download PDF

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Publication number
WO2015113227A1
WO2015113227A1 PCT/CN2014/071704 CN2014071704W WO2015113227A1 WO 2015113227 A1 WO2015113227 A1 WO 2015113227A1 CN 2014071704 W CN2014071704 W CN 2014071704W WO 2015113227 A1 WO2015113227 A1 WO 2015113227A1
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Prior art keywords
signaling
small cell
activation
information
deactivation
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PCT/CN2014/071704
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English (en)
Inventor
Pei-Kai Liao
Jing Xiao
Xiangyang Zhuang
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Mediatek Inc.
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Priority to PCT/CN2014/071704 priority Critical patent/WO2015113227A1/fr
Publication of WO2015113227A1 publication Critical patent/WO2015113227A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the disclosed embodiments relate generally to mobile communication networks, and, more particularly, to power-efficient methods.
  • small cells are low-power radio access nodes that operate in either licensed or unlicensed spectrum with a coverage radius ranging from tens to hundreds of meters.
  • a coverage radius ranging from tens to hundreds of meters.
  • mobile network operators are eagerly looking for methods to enhance the utilization efficiency of available radio spectrum by either spectrum efficiency improvement in licensed band or mobile data offloading in unlicensed band.
  • Deployment of small cells as a technology providing promising gain in radio spectrum utilization efficiency receives broad attention from mobile network operators in recent years and 3 GPP is also planning to enable this feature in the next release of LTE system.
  • time-domain muting scheme together with interference cancellation receiver techniques are utilized for inter-cell interference coordination/cancellation to enable the cell range extension of picocells for better mobile data offloading from macrocell in the heterogeneous networks (HetNet), where there are deployments of both macrocells and picocells sharing the same frequency band.
  • HetNet heterogeneous networks
  • coordinated multi-point (CoMP) operation is also enabled to provide more system throughput gain with more tightly cooperation among base stations (eNB) in HetNet.
  • eNB base stations
  • Small cells generally include picocells, hotspot, femtocells, and microcells in licensed band and WiFi AP in unlicensed band.
  • 3 GPP Release 12 LTE system the techniques to enable the deployment of small cells in licensed band will be the main focus in RAN working groups. Due to possible acquisition of 3.5 GHz frequency bands, it enables the possibility of non-cochannel deployments for small cells to relief interference issues between macrocells and small cells. As one of considered scenarios, the signaling overhead of mobility management and the time radio access interruption due to handover can be improved by assigning the frequency band for the deployment of macrocells as a mobility layer and the other frequency band for the deployment of small cells as a capacity layer. In addition to non-cochannel deployment, further enhancements on the inter-cell interference coordination/cancellation techniques are also considered and under evaluation for cochannel deployment.
  • Small cell on/off operation is one of promising technique to reduce the level of inter-cell interference for better user packet throughput.
  • performance impact on legacy UEs there is trade-off between the performance impact on legacy UEs and performance improvement of UEs supporting small cell on/off operation.
  • transition time between small cell on and off is large, there is even UE performance degradation to support small cell on/off operation.
  • transition time between on and off is zero, there is large performance impact on legacy UEs.
  • a better compromise is to allow a short transition time between small cell on and off so as to keep tolerable performance impact on legacy UEs and acceptable performance gain on UEs supporting small cell on/off operation.
  • CA mechanism With ideal backhaul between MeNB (macrocell basestation) and SeNB (small cell basestation), CA mechanism is able to support small cell on/off operation in an efficient way.
  • MeNB macrocell basestation
  • SeNB small cell basestation
  • existing mechanisms are not sufficient.
  • Related mechanisms to support fast small cell on/off operation for non-ideal backhaul case are still under discussion in 3GPP RANI .
  • a method supporting fast turn-on operation of a small cell comprising: receiving a signaling of activation information transmitted from a small cell basestation on a second frequency band utilized by the small cell periodically if an UE has activated a first set of UE activities for the second frequency band based on the activation signaling transmitted from a macrocell basestation on a first frequency band; determining the activation time based on the received activation information if an UE receives the signaling of activation information; and activating a second set of UE activities for the second frequency band at the determined activation time within a tolerable time period after the determined activation time.
  • a method supporting fast turn-off operation of a small cell comprising: receiving a signaling of deactivation information transmitted from a small cell basestation on a second frequency band utilized by the small cell if an UE has activated all UE activities for the second frequency band and detects the small cell basestation remains in turn-on state; determining the deactivation time based on the received deactivation information if an UE receives the signaling of deactivation information; deactivating a second set of UE activities for the second frequency band at the determined deactivation time within a tolerable time period after the determined deactivation time; and deactivating a first set of UE activities for the second frequency band within a tolerable time period if an UE receives the deactivation signaling transmitted from a macrocell basestation on a first frequency band.
  • Figure 1 schematically shows a Illustration of PRBs and a PRB pair according to the embodiments of the current invention.
  • Figure 2 shows an exemplary diagram of carrier aggregation activation/ deactivation in LTE Release 11.
  • Figure 3 shows an exemplary illustration of UE behaviors in the proposed mechanism according to the embodiments of the current invention.
  • Figure 4 shows an exemplary illustration of downlink procedure when the downlink signaling of activation/ deactivation information from an Se B to an UE is cell-specific according to the embodiments of the current invention.
  • Figure 5 shows an exemplary illustration of downlink procedure when the downlink signaling of activation/ deactivation information from an SeNB to an UE is UE-specific according to the embodiments of the current invention.
  • Figure 6 shows an exemplary illustration of uplink procedure when the downlink signaling of activation/ deactivation information from an SeNB to an UE is cell-specific according to the embodiments of the current invention.
  • Figure 7 shows an exemplary illustration of uplink procedure when the downlink signaling of activation/ deactivation information from an SeNB to an UE is UE-specific according to the embodiments of the current invention.
  • Figure 8 shows an exemplary illustration for the transmission timing of the downlink signaling according to the embodiments of the current invention.
  • the radio resource is partitioned into radio frames, each of which consists of 10 subframes.
  • Each subframe has a time length of 1 ms and is comprised of 2 slots and each slot has 7 OFDMA symbols in the case of normal Cyclic Prefix (CP) and 6 OFDMA symbols in case of extended CP.
  • Each OFDMA symbol further consists of a number of OFDMA subcarriers in frequency domain depending on the system bandwidth.
  • the basic unit of the resource grid is called Resource Element (RE) which spans an OFDMA subcarrier in frequency domain over one OFDMA symbol in time domain.
  • RE Resource Element
  • a physical resource block (PRB) consists of 12 subcarriers in frequency domain and 1 slot in time domain, which constitutes 84 REs in normal CP and 72 REs in extended CP.
  • PRB pair Two PRBs locating in the same frequency location spans in different slots within a subframe is called a PRB pair.
  • Figure 1 illustrates two examples for both normal and extended CP.
  • an UE When an UE is turned on in a cell or handovers to a cell, it performs downlink synchronization and system information acquisition before conducting random access process to get RRC-layer connected. Downlink synchronization is performed by an UE with primary and secondary synchronization signals (PSS and SSS) to synchronize the carrier frequency and align OFDM symbol boundary between the base station of a cell and an UE. Further frequency and timing fine-tune or tracking is carried out continuously with cell- specific reference signal (CRS) by an UE.
  • CRS is a kind of common pilots which are always transmitted in whole channel bandwidth in every subframe no matter whether there is data transmission.
  • CRS When there is data transmission, CRS is not precoded with a MIMO precoder even if MIMO precoding is applied so CRS can also be utilized for the coherent data demodulation when there is precoding information provided to an UE.
  • UE-specific reference signals DMRS
  • DMRS UE- specific reference signals
  • DMRS is only transmitted in the radio resources where there is data transmission and it is precoded with the same MIMO precoder together with the data tones for a specific UE if MIMO precoding is applied and it is mainly utilized for coherent data demodulation.
  • MIB Master information block
  • SFN system frame number
  • PHICH physical HARQ indicator channel
  • PBCH physical broadcast channel
  • SIB1 and other SIBs are carried in physical downlink shared channel (PDSCH), which is scheduled by downlink physical control channel (PDCCH).
  • PDSCH physical downlink shared channel
  • PDCCH downlink physical control channel
  • SIB1 is transmitted every second radio frame with a fixed periodicity of 8 radio frames while other SIBs has variable periodicity configured in SIB1.
  • hotzone scenario is the main focus and both sparse and dense small cell deployments within a hotzone are considered for different traffic density requirements.
  • hotzone scenario is the main focus and both sparse and dense small cell deployments within a hotzone are considered for different traffic density requirements.
  • indoor and outdoor small cell deployments are considered as well.
  • user distribution may vary with time and places within a hotzone (e.g. more users in a office building during the day time and less users during the night time; higher user density in the stores on sale in a department)
  • small cell on-off operation and load balancing among small cells may be required for network power efficiency, interference control and higher user throughput.
  • DRS discovery reference signal
  • Faster discovery, including cell detection and measurements for cell association, of small cell with DRS also facilitates fast small cell “on” (active- state) and "off' (non-active-state) operation because a small cell doesn't need to transmit PSS/SSS and CRS for a long while for UE to detect and conduct measurements.
  • Active-state of a small cell means that there is at least PSS/SSS and CRS transmission while non-active- state of a small cell means that there is no signal transmission except DRS transmission. Therefore, the concept of non- active-state is different from commonly known dormant- state, where there is no signal transmission at all.
  • "on” means active-state and "off' means non- active-state in later description.
  • co-channel deployment There are two deployment scenarios for small cells - 1) co-channel deployment; 2) non-cochannel deployment.
  • co-channel deployment macrocells and small cells are deployed using the same carrier frequency.
  • non- cochannel deployment macrocells and small cells are deployed using difference carrier frequencies.
  • the proposed mechanism decouples part or all of UE activities related to the configured small cell(s), e.g. channel state information (CSI) reporting, downlink control information (DCI) monitoring, sounding reference signal (SRS) transmission on Scell and power headroom reporting (PUR) in 3 GPP LTE system, from MeNB's Scell activation/ deactivation signaling and part or all of UE activities is controlled by SeNB's signaling.
  • CSI channel state information
  • DCI downlink control information
  • SRS sounding reference signal
  • PUR power headroom reporting
  • UE activities related to the configured small cell(s) on Pcell synchronizes with Scell activation/ deactivation signaling from MeNB but 2 nd set of UE activities related to the configured small cell(s), e.g. UE activities related to the configured small cell(s) on Scell, can synchronize with the activation/ deactivation signaling from SeNB.
  • all UE activities related to the configured small cell(s) synchronize with activation/ deactivation signaling from SeNB.
  • the signaling is used to notify UE the activation information, e.g. activation time, in small cell "on'V'off ' operation.
  • the signaling can be physical-layer or MAC-layer signaling.
  • the signaling is carried in or together with discovery reference signal.
  • the information can be determined by the code sequences of the discovery reference signal.
  • the signaling is carried together with discovery reference signal, it is carried by a physical channel in the same time slot where the discovery reference signal exists.
  • the signaling can be either cell-specific or UE-specific.
  • the signaled activation information means the time the small cell is turned on and an UE's receiver/ transmitter should be ready for all activities or remaining activities not activated related to the configured small cell(s), e.g. CSI reporting, DCI monitoring, SRS transmission on Scell and PHR at the signaled time.
  • the signaled activation information means the time an UE's receiver/ transmitter should be ready for all activities or remaining activities not activated related to the configured small cell(s), e.g. CSI reporting, DCI monitoring, SRS transmission on Scell and PHR.
  • the signaling can be physical-layer or MAC-layer signaling, e.g. downlink control information (DCI) in PDCCH, MAC control element (CE) in PDSCH in 3 GPP LTE system.
  • DCI downlink control information
  • CE MAC control element
  • the signaling is carried in or together with discovery reference signal.
  • the information can be determined by the code sequences of the discovery reference signal.
  • the signaling is carried together with discovery reference signal, it is carried by a physical channel in the same time slot where the discovery reference signal exists.
  • the signaling can be either cell-specific or UE-specific.
  • the signaled deactivation information means the time the small cell is turned off and an UE can stop all or part of activities related to the configured small cell(s), e.g. CSI reporting, DCI monitoring, SRS transmission on Scell and PHR at the signaled time.
  • the signaled deactivation information means the time an UE can stop all or part of activities related to the configured small cell(s), e.g. CSI reporting, DCI monitoring, SRS transmission on Scell and PHR.
  • the acknowledgement signal is used to acknowledge the received activation information and it is transmitted at or after the time indicated in the activation information.
  • the acknowledgement signal is a physical signal, a physical channel or
  • MAC-layer signaling e.g. PRACH, uplink DMRS, PUCCH or MAC CE in PDSCH in 3 GPP LTE system.
  • the physical resource for the acknowledgement signal is non-contention- based and is configured by higher-layer, e.g. RRC-layer in LTE system.
  • the triggering signal is used to trigger SeNB from "off to "on” state when there is uplink data packet in an UE.
  • the triggering signal is a physical signal, a physical channel or MAC-layer signaling, e.g. PRACH, uplink DMRS, PUCCH or MAC CE in PDSCH in 3 GPP LTE system.
  • the physical resource for the triggering signal is non-contention-based and is configured by higher-layer, e.g. RRC-layer in LTE system.
  • the example procedures to support fast small cell "on'V'off' operation is shown in the following subsections, assuming UE's receiver/transmitter for the carrier frequency of small cells are off at the beginning.
  • the states of an Se B can be divided into active state ("on" state), non-active state ("off' state, where there is DRS transmission only) and dormant state (completely off state, where there is no signal transmission).
  • An Me B is able to active an SeNB from dormant state to active state and deactivate an SeNB from active state to dormant state only in this invention.
  • Step 1 When receiving MAC-layer activation signaling from MeNB to activate a carrier frequency for small cells, UE turns on its receiver/ transmitter for the signaled carrier frequency and activates UE activities related to the configured small cell(s) on the carrier frequency for MeNB within a tolerable time period.
  • o UE can turn off its receiver/ transmitter temporarily for the carrier frequency of the configured small cell(s) for power saving when no UE activities related to the configured small cell(s) are needed.
  • the UE activities include CSI reporting and PHR related to the configured small cell(s) transmitted to MeNB.
  • Step 2 When receiving downlink signaling of activation information from SeNB, UE activates the UE activities related to the configured small cell(s) on the carrier frequency for the corresponding SeNB(s) at the time indicated by the received activation information.
  • the downlink signaling of activation information can be either cell-specific or UE-specific.
  • ⁇ UE-specific downlink signaling of activation information is more beneficial to UE power efficiency.
  • the UE activities include DCI monitoring, SRS transmission, CSI reporting and PUR for the configured small cell(s) transmitted to SeNB.
  • Step 3 UE transmits the uplink acknowledgement signal to SeNB at or/ and after the time indicated by the received activation information.
  • o UE can transmit the uplink acknowledgement signal for several times until it detects its first downlink scheduler, Se B's signal transmission, or the maximal transmission number is achieved.
  • UE can deactivate the UE activities related to the configured small cell(s) on the carrier frequency for the corresponding Se B(s) and go back to Step 2 if UE receives downlink signaling of activation information from an Se B.
  • Step 4 When receiving downlink signaling of deactivation information from SeNB, UE deactivates the UE activities related to the configured small cell(s) on the carrier frequency for the corresponding SeNB(s) at the time indicated by the received deactivation information.
  • the downlink signaling of deactivation information can be either cell-specific or UE-specific.
  • ⁇ UE-specific downlink signaling of deactivation information is more beneficial to UE power efficiency.
  • the UE activities include DCI monitoring, SRS transmission, CSI reporting and PHR for the configured small cell(s) transmitted to SeNB.
  • Step 5 Continue Step 2-4 if there are more downlink data packets from SeNB and it's in "off state.
  • Step 6 When receiving MAC-layer deactivation signaling from MeNB to deactivate a carrier frequency for small cells, UE turns off its receiver/ transmitter for the signaled carrier frequency and deactivates all UE activities related to the configured small cell(s) within a tolerable time period.
  • Figure 5 and 6 illustrate two examples for downlink procedure when the downlink signaling of activation/ deactivation information from an SeNB to an UE is cell-specific and UE-specific, respectively.
  • Step 1 When receiving MAC-layer activation signaling from MeNB to activate a carrier frequency for small cells, UE turns on its receiver/transmitter for the signaled carrier frequency and activates UE activities related to the configured small cell(s) on the carrier frequency for Me B within a tolerable time period.
  • o UE can turn off its receiver/transmitter temporarily for the carrier frequency of the configured small cell(s) for power saving when no UE activities related to the configured small cell(s) are needed.
  • the UE activities include CSI reporting and PHR related to the configured small cell(s) transmitted to MeNB.
  • Step 2 When there is uplink data packet for transmission at the UE side, UE transmits uplink triggering signal to an SeNB to activate it if it's in "off state.
  • o UE can transmit the uplink triggering signal for several times until it detects its first uplink scheduler, SeNB's signal transmission, or the maximal transmission number is achieved.
  • Step 3 When receiving downlink signaling of deactivation information from SeNB and there is no more uplink data packet for transmission at the UE side, UE deactivates the UE activities related to the configured small cell(s) on the carrier frequency for the corresponding SeNB(s) at the signaled time.
  • the downlink signaling of deactivation information can be either cell-specific or UE-specific.
  • ⁇ UE-specific downlink signaling of deactivation information is more beneficial to UE power efficiency.
  • the UE activities include DCI monitoring, SRS transmission, CSI reporting and PFIR for the configured small cell(s) transmitted to SeNB.
  • Step 4 Continue Step 2-3 if there are more uplink data packets for transmission at the UE side and SeNB is in "off state.
  • Step 5 When receiving MAC-layer deactivation signaling from MeNB to deactivate a carrier frequency for small cells, UE turns off its receiver/ transmitter for the signaled carrier frequency and deactivates all UE activities related to the configured small cell(s) within a tolerable time period.
  • Figure 7 and 8 illustrate two examples for uplink procedure when the downlink signaling of activation/ deactivation information from an SeNB to an UE is cell-specific and UE-specific, respectively.
  • the downlink signaling of activation/ deactivation information transmitted from an SeNB to an UE can be carried by a type of downlink control information (DCI) in a physical downlink control channel, e.g. PDCCH in 3GPP LTE system.
  • DCI downlink control information
  • the physical downlink control channel can be transmitted in the radio resources for broadcasting purpose, e.g. common search space in 3GPP LTE system, and single or one of multiple specific identifications are embedded within it for UE's identification, e.g. RNTI used to scramble the CRC bits of PDCCH in 3 GPP LTE system.
  • the same type of DCI can carry activation information, deactivation information or both.
  • the type of DCI carries either activation or deactivation information
  • an indicator within the DCI is needed for an UE to identify.
  • the downlink signaling is cell-specific, the same activation/ deactivation information is broadcasted from an SeNB to all UEs. In this case, the activation/ deactivation information can determine the time the SeNB switches to "on" state or "off' state.
  • the downlink signaling is UE-specific, different activation/ deactivation information is either unicasted or multi-casted from an SeNB to one or a group of UEs and UE can identify whether the signaling is for it by the embedded identification configured by higher-layer to the UE.
  • the activation/ deactivation information can determine the time an UE's receiver and transmitter should be ready for reception (for activation signaling) and transmission or turned off (for deactivation signaling) within a tolerable time period.
  • Single DCI can carry the activation/ deactivation information for single or a group of UEs.
  • the downlink signaling of activation/ deactivation information is transmitted in or together with DRS.
  • the downlink signaling of activation/ deactivation information is transmitted in a set of time slots, which can include the time slot DRS exists, and the content doesn't change within a reconfiguration time period.
  • the downlink signaling can be transmitted more than one time within a reconfiguration time period.
  • Figure 8 illustrates an example regarding to the transmission timing of the downlink signaling.
  • the signaling of the activation information is transmitted in or together with DRS from an SeNB to an UE when the SeNB is in "on" state.
  • the signaling of the deactivation information is transmitted from an SeNB to an UE with the transmission number equal to or larger than one in a set of time slots when the SeNB is in "off' state.
  • the transmission time of the deactivation information is not limited to the time slots DRS exists.
  • the uplink acknowledgement signal from an UE to an Se B can be a dedicated random access channel configured by higher-layer for the UE, e.g. PRACH in 3 GPP LTE system, or a dedicated physical uplink channel for scheduling request (SR) configured by higher-layer for the UE, e.g. PUCCH used for SR in 3 GPP LTE system. It also can be a dedicated physical uplink channel for CSI reporting configured by higher-layer for the UE, e.g. PUCCH used for CSI reporting in 3GPP LTE system, or a dedicated physical uplink signal configured by higher-layer for the UE, e.g. uplink DMRS in 3GPP LTE system.
  • SR scheduling request
  • UE can transmit the uplink acknowledgement signal for several times until it detects its first downlink scheduler or the maximal transmission number is achieved. If the transmission of the uplink acknowledgement signal from the UE achieves the maximal transmission number and there is no downlink scheduler for it for a period of time after the last uplink acknowledgement signal, UE can deactivate the UE activities related to the configured small cell(s) on the carrier frequency for the corresponding Se B(s).
  • the uplink triggering signal from an UE to an SeNB can be a dedicated random access channel configured by higher-layer for the UE, e.g. PRACH in 3GPP LTE system, or a dedicated physical uplink channel for scheduling request (SR) configured by higher-layer for the UE, e.g. PUCCH used for SR in 3GPP LTE system. It also can be a dedicated physical uplink channel for CSI reporting configured by higher-layer for the UE, e.g. PUCCH used for CSI reporting in 3GPP LTE system, or a dedicated physical uplink signal configured by higher-layer for the UE, e.g. uplink DMRS in 3 GPP LTE system. UE can transmit the uplink triggering signal for several times until it detects its first uplink scheduler, SeNB's signal transmission, or the maximal transmission number is achieved.
  • SR scheduling request

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne des procédés de prise en charge d'une fonction d'activation rapide d'une microcellule. Dans un mode de réalisation, l'invention porte sur le procédé de prise en charge de fonction d'activation rapide d'une microcellule, le procédé consistant à : recevoir une signalisation d'informations d'activation émises à partir d'une station de base à microcellules sur une seconde bande de fréquence utilisée par la microcellule périodiquement si un UE a activé un premier ensemble d'activités d'UE pour la seconde bande de fréquence sur la base de la signalisation d'activation émise à partir d'une station de base à macrocellules sur une première bande de fréquence; déterminer le temps d'activation sur la base des informations d'activation reçues si un UE reçoit la signalisation des informations d'activation; et activer un second ensemble d'activités d'UE pour la seconde bande de fréquence au niveau du temps d'activation prédéfini dans une période de temps tolérable après le temps d'activation déterminé.
PCT/CN2014/071704 2014-01-28 2014-01-28 Procédés de fonctionnement d'activation/désactivation de microcellules reposant sur une signalisation par radio de microcellules WO2015113227A1 (fr)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN114175548A (zh) * 2019-05-03 2022-03-11 Lg 电子株式会社 在无线通信系统中通过预配置的上行链路资源监视搜索空间的方法及其设备
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